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electrical resistance gypsum block, neutron probes, or time-domain reflectometry (TDR) can be used to determine soil water potential energy. Tensiometers are limited to 0 to -85 kPa, electrical resistance blocks are limited to -90 to -1500 kPa, neutron probes are limited to 0 to -1500 kPa, and a TDR is limited to 0 to -10,000 kPa. A scale can estimate water weight (percentage

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